.contentfd{

    width:100%;
    height:auto;
    border:1px solid #000;
    margin:0 auto;
}
.navfd {
    width:100%;
    height:40px;
    line-height: 40px;
    font-size: 20px;
    margin:0 auto;
    background:#c7ddef;
    position:fixed;
    bottom:0;
    text-align:center;
    z-index:199;
}